LIVE OAK -- An oceanfront home at the end of Geoffroy Drive was destroyed by fire Sunday night, Central Fire Protection District officials said.

The greenish-colored, cliff-side home was vacant and is believed to be a vacation home, said Inspector Mike DeMars of Central Fire.

Firefighters received a call from a neighbor about 10 p.m., and they arrived to find flames shooting through the roof of the two-story building and a partially nude, incoherent young woman staring at the fire, DeMars said.

The cause is under investigation, he said.

"It's going to be hard to determine a cause because there is so much damage," he said. "It's gutted. It was a delayed report. Many of the homes here are second homes."

Investigators hope to talk to the young woman who was seen standing outside the home, DeMars said. She was naked from the waist up and disoriented and unable to talk to firefighters Sunday night, he said. Sheriff's deputies transported her to Dominican Hospital for evaluation, he said.

The home did not have sprinklers or alarms, DeMars said.

If the home is rebuilt, law now will require installation of a fire sprinkler system, he said.

DeMars remembered a fire on Geoffroy Drive about 20 years ago that destroyed two homes late one night, in part because the neighborhood was largely vacant and no one spotted the fire until it had gotten out of control. He said a new hydrant was installed after that fire, which they used Sunday.